"It has been a long time since we enjoyed such broad-based gains," David Blitzer, chairman of S&P Indices' index committee, says in that report. "While one month does not make a trend ... [the news] is a good sign."

According to the data:

-- Detroit was the only one of 20 major metropolitan areas to see home prices fall in April. They dropped 3.6 percent in the Motor City from the month before.

-- The largest increase for the month was San Francisco's 3.4 percent.

-- In Phoenix, where the housing sector was hit particularly hard when the real estate bubble burst, prices were up 8.6 percent from April 2011.

-- The indices' 10-city and 20-city composite indexes were both up 1.3 percent in April from March. But, both of those broad measures were still down from a year earlier — the 10-city composite by 2.2 percent and the 20-city composite by 1.9 percent. Bloomberg News notes, however, that the 20-city index's decline from a year earlier is the smallest such year-over-year drop since November 2010.

Reuters points out that the month-to-month increase in the broader measures of home prices is the third such gain in a row, "suggesting the recovery in the housing market is gaining traction."